<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../../js/vue.js"></script>
    <style>
        .basic {
            width: 400px;
            height: 100px;
            border: 1px solid black;
        }

        .happy {
            border: 4px solid red;
            background-color: rgba(255, 255, 0, 0.644);
            background: linear-gradient(30deg, yellow, pink, orange, yellow);
        }

        .sad {
            border: 4px dashed rgb(2, 197, 2);
            background-color: gray;
        }

        .normal {
            background-color: skyblue;
        }

        .atguigu1 {
            background-color: yellowgreen;
        }

        .atguigu2 {
            font-size: 30px;
            text-shadow: 2px 2px 10px red;
        }

        .atguigu3 {
            border-radius: 20px;
        }
    </style>
</head>

<body>
    <div id="root">
        <!-- 绑定class样式--字符串写法：样式的类名不确定，需要动态指定 -->
        <div class="basic" :class="mood" @click="changeMood">{{name}}</div><br><br>

        <!-- 绑定class样式--数组写法：要绑定的样式个数不确定，名字也不确定 -->
        <div class="basic" :class="classArr">{{name}}</div><br><br>

        <!-- 绑定class样式--对象写法：要绑定的样式个数，名字都确定，但动态决定用不用 -->
        <div class="basic" :class="classObj">{{name}}</div><br><br>

        <!-- 绑定style样式 -->
        <!-- <div class="basic" :style="{fontSize:fsize+'px'}">{{name}}</div><br><br> -->
        <div class="basic" :style="styleObj">{{name}}</div><br><br>
        <!-- <div class="basic" :style="[]">{{name}}</div><br><br> -->
    </div>

    <script>
        Vue.config.productionTip = false //取消生产提示

        const vm = new Vue({
            el: '#root',
            data() {
                return {
                    name: '尚硅谷',
                    mood: 'normal',
                    classArr: ['atguigu1', 'atguigu2', 'atguigu3'],
                    classObj: {
                        atguigu1: true,
                        atguigu2: false,
                        atguigu3: false,
                    },
                    // fsize: 40
                    styleObj1: {
                        fontSize: '40px',
                        color: 'red',
                        backgroundColor: 'pink'
                    }
                }
            },
            methods: {
                //绑定class样式--字符串写法
                // changeMood() {
                //     this.mood = 'happy'
                // },
                changeMood() {
                    var arr = ['happy', 'sad', 'normal']
                    var str = Math.floor(Math.random() * 3)
                    this.mood = arr[str]
                }
            },
        })
    </script>
</body>

</html>